The hinge bears static load, while the upper hinge bears static load and bears torque. The composite hinge bears the actual load-bearing weight. After adding external suspension force, the vertical position of the free end of the door leaf and window sash does not change more than 1.5 mm. The specimen will not deform or be damaged and can be opened normally....

There is no national unified standard for hinges, as each consumer has different specifications or materials suitable for them. Some special size manufacturers also support customization. When choosing hinges on the market, we also need to consider their thickness, because in some aspects, thickness determines the strength of the product....

Stainless steel hinge is one of the hinges, and stainless steel is one of the many materials. After the elements in stainless steel come into contact with the atmosphere, an oxide film is produced, which can prevent the continued infiltration of oxygen atoms and thus has anti-corrosion properties. From this, we can infer that when the surface of the stainless steel hinge is corroded, this layer of film naturally has no effect, so the ability to prevent corrosion is also lost, leading to rusting....

Firstly, there is touch inspection. Our inspector wears gloves to touch the surface of the stamped parts. This method belongs to direct contact and requires a high level of experience from the operator. Of course, this method is one of the fastest. Next is the oilstone polishing method, which mainly depends on the surface condition of the hinge. Use flexible gauze to finely polish the surface of the hinge without any indentation....